"Isotope" Essays and Research Papers

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Mass Spectrometer

spectrometer has been a universal research tool, mostly involved in comparing the masses of atoms. Since the invention of this tool about 100 years ago, the mass spectrometer has been responsible for the description of molecular structure, the detection of isotopes, the classification of atomic weights and more! The mass spectrometer has been vital to chemistry, and will continue to do so for more years to come. The history of the mass spectrometer starts with a man named Sir Joseph John Thompson. Thompson...

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Element Builder

Name: _____Alvaro_________________________________ Date: ________________________ Student Exploration: Element Builder Vocabulary: atom, atomic number, electron, electron dot diagram, element, energy level, ion, isotope, mass number, neutron, nucleus, periodic table, proton, radioactive, valence electrons Prior Knowledge Questions (Do these BEFORE using the Gizmo.) 1. What are some of the different substances that make up a pizza? _____________________ ___________________...

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Atomic Number and Tellurium

of all the protons, electrons, and neutrons within the atom at rest. As shown on the periodic table, tellurium has an atomic number of 52, and a mass of 127.60. Isotopes are atoms with the same number of protons, but have different number of neutrons. Tellurium has 33 isotopes and when it occurs naturally it has a mix of eight isotopes: 120Te (0.1%), 122Te (2.6%), 123Te (0.9%), 124Te (4.8%), 125Te (7.1%), 126Te (19.0%), 128Te (31.7%), and 130Te (33.8%). Tellurium’s usual and most commonly found...

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Barium Essay for Chemistry

baryta or BaO. But it was discovered in 1779 by Carl Scheele. Barium is classified as an alkaline-earth metal. Its atomic number is 56 and it is the fifth element in group 2.Natural Barium is made up of a mixture of seven stable isotopes, there are thirteen radioactive isotopes known to exist. Barium has never been found in nature in its pure form. When Scheele discovered barium in the 1700's he could not isolate it he could only isolate the barium oxide. Another person to isolate the barium oxide was...

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Isotopes and Its Uses

ISOTOPES History of the term: In the bottom right corner of JJ Thomson's photographic plate are the separate impact marks for the two isotopes of neon: neon-20 and neon-22. The term isotope was coined in 1913 by Margaret Todd, a Scottish physician, during a conversation with Frederick Soddy (to whom she was distantly related by marriage).[4] Soddy, a chemist at Glasgow University, explained that it appeared from his investigations as if each position in the periodic table was occupied by multiple...

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Development of Atomic Theory

DEVELOPMENT OF THE ATOMIC THEORY Part A: HISTORY * 1869: Mendeleev formulated the Table of the Elements - listing them by their atomic weight and grouping them with similar characteristics. * 1897: JJ Thomson discovered electron and isotopes, and invented the mass spectrometer. * 1898: Marie Curie discovered and isolated radium, a new element which unprompted disintegrated into other elements. This proved that the atoms of one element at least were not indivisible. * 1911: Ernest...

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Atomic Theory - Essay

Dalton’s theory are that his second law that all atoms of the same element are the same is false because today we have found that there are other kinds of atoms called isotopes. An isotope is an atom that has the same amount of electrons and protons, but it has more neutrons that increase its atomic mass. Some examples of isotopes are Carbon 12, carbon 13, carbon 14, Uranium (234, 235, and 238) and lithium (6, 7). Carbon 14 is especially useful because we know its rate of decay and can use to find...

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Potassium Argon Dating

must understand that every living thing is made of Carbon [C]. When an organism dies it no longer uses this carbon, leaving an unstable isotope of Carbon which decays into Nitrogen at a pace called a "half-life". This term "half-life" is defined as: the time it takes for one-half of the atoms of a radioactive material to disintegrate. Half-lives for various isotopes can range from a few microseconds to billions of years, but the half-life for carbon (carbon 14, the form of carbon found in organisms)...

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Honors Chem

nitrogen – 16 3. All isotopes of technetium are radioactive, but they have widely varying half-lives. If an 800.0 g sample of technetium-99 decays to 100.0 g of technetium-99 in 639 000 yrs, what is its half-life? 800g/2 400g/2 200g/2 100g…3 half lives have passed 639,000years/3 half lives = 213,000 years half-life of technetium – 99 4. A 208 g sample of sodium-24 decays to 13.0 g of sodium-24 within 60.0 hrs. What is the half-life of this radioactive isotope? 208g/2 104g/2 52g/2...

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Half-life of a Radioisotope

The Half-Life of a Radioisotope: 10-22-14 Abstract: The half-life of a radioisotope is the time required for half the atoms in a given sample to undergo radioactive, or nuclear decay. The amount of radioactive isotope remaining can be calculated using the equation, t1/2 = .693/K. A sample data set was provided due to safety concerns. Using the data set, a half-life of 14.27days -1 was calculated using graphical linear regression analysis. Introduction: The purpose of this experiment is to...

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